You can check the ESD factor bu spraying a Q-tip with staic gaurd and wiping down the main, and tail gears with ti, then hold it against the tail belt through the fram and rotate the head until the belt has mad a complete revolution. If its static this will get rid of it for a while(the slow wag). It wont last long, at most a couple of flights unless you really soak it. I had a similar issue with my 500CF and this would cure it temporarily. If it cures the wag, then look into one of the static mods longer term.

Lowered gain all the way to 20%, no help.
Changed the position of the ball link in the servo lever arm, no help.
Tried 3 different power packs, no help.
Rerouted all wires, isolated gyro cables and motor cables, no help.

My theory either the spartan 760 is broken is broken or there is something from with the Align ESC causing it to bog/hunt and thus force the gyro system to do impossible corrections.

Btw at first flight there were no issus at all. This came on the third pack.

You wrote that you do not fly gov mode? Then it should not be possible for a negative feedback loop to develop between gyro and esc. It is possible, just, that your motor is running "rough" in so much as that the esc's motor timing does not work to produce the silkiest run. Try setting motor timing to "high" to see whether it makes any difference.

Also, I might have missed the key words in this thread, could I ask you to recap:
- how violent are those twitches?
- what's the periodicity?
- is it a wag left/right around center? or does it kick out to one side and resets to center?
- what happens under max climb-out? at 20% you should really lose the tail...
- what happens when the gyro's switched into YR mode? (it may drift coz your tail isn't trimmed mechanically; but does it twitch?)
- what diameter tr are you flying? (I hadn't thought it matters unless the thing's soo small that the max travel of the gyro isn't enough to catch promptly.)
- is the tail slider perfectly smooth? (That is important.)

- is it a wag left/right around center? or does it kick out to one side and resets to center?
it resets to the center

- what happens under max climb-out? at 20% you should really lose the tail...
at 20% we could still fly it but it didnt hold the tail

- what happens when the gyro's switched into YR mode? (it may drift coz your tail isn't trimmed mechanically; but does it twitch?)
I havent tried it..

- what diameter tr are you flying? (I hadn't thought it matters unless the thing's soo small that the max travel of the gyro isn't enough to catch promptly.)
iam not sure i understnad but i tried between 2,3,4 th hole on a standard servo arm.

- is the tail slider perfectly smooth? (That is important.)
its perfect..

Ok, now think hard about this question:
When you hover your bird, you will invariably constantly be adjusting collective (as the air flow changes) in order to maintain altitude. Could it be that the one-sided twitch that you see correlates to the collective instructions that you give? That is, could it be that a short stab up is followed by a twitch to the left, and vice versa?

Ok, now think hard about this question:
When you hover your bird, you will invariably constantly be adjusting collective (as the air flow changes) in order to maintain altitude. Could it be that the one-sided twitch that you see correlates to the collective instructions that you give? That is, could it be that a short stab up is followed by a twitch to the left, and vice versa?

Well, let's think: you have a clock-wise rotor whose thrust force is opposed by a counter-clockwise torque vector. If you increase collective thrust you increase counter-clockwise torque ... and your tail should be expected to kick out to the right. That's what you would expect to happen if the tail is "loose", ie the gyro gain is too low.

So opposite recommendation: increase your gyro gain until your tail begins to oscillate around center (swinging left to right). Then back off a notch or two...

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